Extra hrec noises were present during tonight locks (Figures 1 and 2):
We do not know it the two are related.
Investigating we found that the PSTAB0 line at 43 Hz is injected. and it is seen in various INJ signals (Figure 3).
The plan is to try to switch it off after locking and check the impack on hrec.
PSTAB0 line (43Hz) has been switched off (amp=0) at 12.52.40UTC.
We could then relock in LN3: the bump at 43 disappeared while the broadband noise was still there.
To be noted that PSTAB1 line (236Hz) is still injected while, as far as I know, not used by any loop.
I have been able to run the noise budget by hand, after changing some of the Pcal channels used that have disappeared in the last two days from the raw data.
Figure 1. Shows that the noise budget thinks the OMC projection is high. Normally it is 2 orders of magnitude below the sensitivity curve.
Figure 2 shows that the OMC error signal spectrum is 3 orders of magnitude higher than usual. The sensing noise is three orders of magnitude higher.
Figure 3. In the lock of ~17:00 UTC the problem is no longer present. Maybe the issue was removed by the restart of the SDB1_OMC process that was done today by Alain around 15:00 UTC.
The issue was due to the release v1r22p17 of Acl . A Cm command related to the ACL_SUM_CH object use to select the error signal was not applied .
Below the messages from the SDB1_OMC logfile
2024-03-25-23h01m05-UTC>WARNING-AcSumChCmSet> OMC1_in1 - missing arguments: cmType "AcSumChSet" -t -d -d -t ... - rtn -1
2024-03-25-23h01m05-UTC>WARNING-AcSumChCmSet> OMC1_in0d5 - missing arguments: cmType "AcSumChSet" -t -d -d -t ... - rtn -1
As a result , the error was not the expected one and as consequence a large correction signal.
The large broadband noise up to some hundred Hz is highly coherent between Hrec and V1:DET_B1_DC, as a result of a dedicated BruCo run: link (I'm currently rerunning the script to fix the cropped y-scale). In the table, you can find also a bunch of channels coherent with the large peak at 43 Hz.
Figure 1: coherence and noise projection of V1:DET_B1_DC to Hrec.
[For some reason, this message has remained in the Drafts, even if I received the notification that it was added to the Logbook...]
Ignore my previous entry. The highlighted channel is one of those recently added to DET, as reported in this logbook entry: #63738. I'm adding them to the excluded channels from BruCo analysis:
/data/dev/detchar/online/bruco/share/virgo_excluded_channels_Hrec_hoft.txt
EDIT: BruCo daily results for Hrec (link) have correctly excluded this channel from the analysis. Unfortunately, I forgot to edit the corresponding list for DARM, and the coherence results for the last day (link) have been dominated by the new DET channel: ignore this channel from the BruCo results.
Now, I have edited the excluded channel list for DARM too. I've opened this git issue to keep track of the various excluded channel lists and keep them up to date.
